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  1. Replies
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    Also it looks like there was some repair work...

    Also it looks like there was some repair work done with the innermost S100 slot.. he's got jumper wires there that appear to connect the same points as the tracks did. I don't see evidence these...
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    Ok so we have a wire going from J2 pin 22 (?...

    Ok so we have a wire going from J2 pin 22 (? there aren't 24 pins but 24 is right next to the last pin in the line) to pin 33 of U105
    We have a wire from S17 to pin 25 of U105 also.
    We have a wire...
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    I was looking at something like this: ...

    I was looking at something like this:

    https://www.ebay.com/itm/293272782936

    The Microbee uses an external brick supply, so I suppose that's easy to remedy. The monitor is curious.. in a...
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    No worries. I think we have something custom...

    No worries. I think we have something custom going on here.. I'm poring over schematics and comparing to these jumper wires he has around. I note the machine usually powers up in a ready state,...
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    Hi Dave, Unfortunately I had some family...

    Hi Dave,

    Unfortunately I had some family events so I didn't get to play with the Netronics machine much at all. I did install a 74LS20 (a few of them actually), just to see what would happen.....
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    Yes switches are set as you prescribed. C000...

    Yes switches are set as you prescribed.

    C000 is in U300.. and it goes on from there.

    Here's a pic of the full board: ...
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    The EPROMs are four 2716s. I was comparing the...

    The EPROMs are four 2716s. I was comparing the first of them, labeled C000-C7FF to what is actually showing up at C000-C7FF.
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    220v to 110v converters

    I just purchased some Microbee stuff and they are 220v. So I was wondering what I should be looking for in terms of wattage and quality for a 110v to 220v converter.. stuff to look out for? Is one...
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    Okay so I set the jumpers both ways you mentioned...

    Okay so I set the jumpers both ways you mentioned above... but yeah.. no change.

    I decided just to do some perfunctory checks and verified the ROMs with my EPROM programmer using known good dumps...
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    Thanks Dave. The revision of my board is D. ...

    Thanks Dave.

    The revision of my board is D.

    I can edit memory contents in the space you mentioned.. just not anywhere else.

    Interestingly, SW200 and SW201 are all set to off.
    ...
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    And yes, I can use the monitor and attempt to...

    And yes, I can use the monitor and attempt to edit memory contents but at $0000 and most ranges I've tried I cannot actually edit anything. I'm still trying to figure out what address space is...
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    I am keeping well, all things considered. Trust...

    I am keeping well, all things considered. Trust same for you? And you don't owe me anything! But I very much appreciate your help and insight for stuff like this. I did end up dumping 'the other...
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    Netronics Explorer 85

    I finally got one of my holy grails.. an Explorer 85 in the actual Netronics chassis. It fires up and the monitor seems to work fine.

    It appears to have the BASIC ROMs installed.. starting at...
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    Yes it was u98.. closer to the FDC.

    Yes it was u98.. closer to the FDC.
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    Yeah the tops of some of the legs of the ICs have...

    Yeah the tops of some of the legs of the ICs have some surface rust, but the legs themselves seem to be fine and same with sockets where applicable. Hopefully the two controller chips get here soon...
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    Not a problem at all -- I appreciate all the...

    Not a problem at all -- I appreciate all the suggestions/help very much.

    Here's the high res shots of the board:
    ...
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    Pin 3 seems to be 4mhz.. so.. yeah. I'm...

    Pin 3 seems to be 4mhz.. so.. yeah.

    I'm curious if all original 1000 boards had all these little jumper wires. The 74ls04 I replaced had three connected to it and I see a bunch elsewhere.
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    Replaced - voltages look ok.. but still no...

    Replaced - voltages look ok.. but still no difference.

    I had a look at the FDC9216 chip next out of curiosity. If I'm reading the block diagram right, I should be seeing a clock coming out of pin...
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    Looks like a little less than 1V at pin 12?

    Looks like a little less than 1V at pin 12?
  20. Replies
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    So I've been looking at the RDDATA line, and I...

    So I've been looking at the RDDATA line, and I see a fairly clean signal up to U107. The signal looks good and clean going into the hex inverter at pin 13 but coming out it seems weak, like it was...
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    Basic 128k machine.

    Basic 128k machine.
  22. Replies
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    I've confirmed everything works as you described....

    I've confirmed everything works as you described. I can see the step signal flashing, dir signal changing, and track 0 being pulled low after a while. But the machine does not really try to read the...
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    Yes I've sort of found the STEP line and am...

    Yes I've sort of found the STEP line and am following it back from the drive.. looks like there is a 74ls38 and 74ls08 involved. Also am rexhexking the board itself in case I broke a trace removing...
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    Okay so I replaced the 7432 and we are further...

    Okay so I replaced the 7432 and we are further along.. the drive spins and you can head the head move at startup briefly. It then goes off, and then engages again when the boot sequence begins. But...
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    Oh I've got scads of those. Will desolder old...

    Oh I've got scads of those. Will desolder old and pop in new tomorrow. Cross fingers.
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